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Finding the Fourth Proportional to 213.38, 294.48 and 139.71

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Solution

The fourth proportional to 213.38, 294.48 and 139.71 is: 192.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.38 : 294.48 = 139.71 : x
  2. Step 2: Convert to fraction form
    213.38/294.48 = 139.71/x
  3. Step 3: Cross multiply
    213.38x = 294.48 × 139.71
  4. Step 4: Simplify right side
    213.38x = 41,141.80
  5. Step 5: Solve for x
    x = 41,141.80/213.38
  6. Step 6: Final answer
    x = 192.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.